Switch control and indication system



May 23, 1 939. c, w, BELL 2,159,518

SWITCH CONTROL AND INDICATION SYSTEM Filed 001). 21, 1938 For 569mlC'azzzjal.

Fig.1.

- INVENTOR Charlarllifiell.

77 aim HIS ATTORNEY Patented May 23, 1939 UNITED STATES PATE T OFFICESWITCH CONTROL AND INDICATION SYSTEM Charles W. Bell, Forest Hills, Pa.,assignor to The Union Switch & Signal Company, Swissvale, Pa., acorporation of Pennsylvania Application October 21, 1938, Serial No.236,291

18 Claims. (01. 246 -219) sociated with the control lever and known asthe 1 quick switch to control movement of the lever.

The fquick switch operates in such a manner that on movement of thecontrol lever away from either of. its positions to'the other position,such as from the normal to the reverse position, the control lever mustbe moved substantially all of the way to the reverse position, and mustremain :lIl that position until the switch has moved to the reverseposition and an indication is received of such movement of the switchbefore the con- 25 trol lever can be returned to the normal position.

, vents a false indication of the position occupied 30 by the switch.

The quick switch mechanism is designed for and is adapted for use inmechanical interlocking machines, and is not adapted for use in allrelaytype interlocking installations. 5 It is an object of my invention toprovide a switch control and indication system which em- H ploys meanswhich may be incorporated in an A further object of my invention is toprovide an improved switch control and indication system in which apolarized auxiliary relay per- 46 forms the functions which have beenperformed heretofore by the quick switch mechanism.

A. further object of my invention is to provide an improved switchcontrol system in which a polarized relay and the switch repeating relay50 jointly control the normal and reverse switch indication or signalcontrol relays in such a manner that on movement of the switch controllever,

II to either of its positions, such as to the reverse position, thenormal indication or signal control I 55 relay cannot thereafterbeenergized unless the switch completes its movement to the reverseposition and effects energization of the reverse indication or signalcontrol relay.

Another object of my invention is to provide an improved switch controlsystem.

Other objects of my invention and features of novelty will be apparentfrom the following description taken in connection with the accompanyingdrawing.

I shall describe one form of apparatus embody 1o ing myinvention,together with a modification which I may employ, and shall then pointout the novel features thereof in claims.

- --In the drawing, Fig. 1 is a diagram of a system embodyingmyinvention, and Fig. 2'is a fragmentary diagrammatic view illustratingamodification which may be employed in the system shown in Fig. 1.

"Referring to the drawing, the reference character W designates arailway track switch which is movable between a normal and a reverseposition'by suitable means such as an electric or a pneumatic motor, notshown. This motor is controlled by means well-known in the art, thismeansincluding a polarized switch control relay 5 This is advantageousas it prevents the switch 'and'the switch control lever from getting outof correspondence With each other and as itj'pre- The system includes,in addition, a polarized switch repeating relay WP, a normal indicationrelay NWP, a reverse indication relay RWP, and

a polarized auxiliary control relay Z. The supply of current to theswitch control relay WR is 'norma-lly'controlled by suitable polechanging means which may be part of an interlocking machine.

As here shown diagrammatically, the pole changing means comprisescontacts Ill and II which are actuated by a control lever L and controlthe supply of current from a battery I4 to 'control Wires I6 and I1.When the control lever terminal C of battery It, while contact I Iconnects' wire I! to terminal B of battery l4 so that current of reverserelative polarity is supplied from battery I4 to wires l6 and I1.

,The circuit from control wires I6 and I! to the winding of the switchcontrol relay WR is confi'trolled by contacts 20 and 2| of lock relayLR.

Contacts 20 and 2| are connected by wires 22 and 23 to the terminals ofthe winding of relay WR.

Contact 20 when picked up engages a stationary contact to which isconnected wire l6, while contact 2! when picked up engages a stationarycontact to which is connected wire IT.

The circuit of the winding of the lock relay LR is controlled by meanswell-known in the art in accordance with trafiic conditions in thevicinity of the switch W so that the winding of relay LR is energizedonly when it is safe to efiect movement of the switch W between its twopositions. At all other times the lock relay LR is deenergized and itscontacts 20 and 2| are released.

The switch W has associated therewith means operative in accordance withthe position occupied by the switch for controlling the polarity of thecurrent supplied from a suitable source, such as a battery 25, to thewinding of the switch repeating relay WP. As shown, this means comprisescontacts 21 and 28 which are connected by suitable wires to terminals ofthe Winding of relay WP. When the switch W is in the normal position asshown in the drawing, contact 21 engages a stationary contact to whichis connected wire 30 leading from terminal B of battery 25, whilecontact 28 engages a stationary contact to which is connected wire 3|leading from terminal C of battery 25 so that current of normal relativepolarity is supplied to the winding of reiay WP.

similarly, when the switch W is in the reverse position, contact 21engages a stationary contact to which is connected a branch of wire 3|leading from terminal C of battery 25, while contact 28 engages astationary contact to which is connected a branch of wire 30 leadingfrom terminal B of battery 25 so that at thistime the winding of relayWP issupplied with current of reverse relative polarity.

The polarized auxiliary control relay Z is pro- 7 vided with twowindingseach of which has one ing from terminal C of battery 25.

movable contact 34 of relay NWP, while contact I terminal connected to abranch of wire 3| lead- The other terminal of winding 32, which may betermed the first winding, is connected by a wire 33 to 1 34 when pickedup engages a stationary contact to which is connected a branch of wire30 leading from terminal B of battery 25. t

The other terminal of winding 36 of relay Z, which winding may be termedthe second winding, is connected by wire 31 to contact 38 of relay RWP,while contact 38 when picked up engages a stationary contact to which isconnected a branch of wire 30 leading from terminal B of battery 25.

It will be seen that when the contacts of relay NWP are picked up, thefirst winding 32 of auxiliary relay Z is energized, while when thecontacts of relay RWP are picked up, the second winding 36 of auxiliaryrelay Z is energized. The windings 32 and 36 of auxiliary relay Z arearranged so that when winding 32 is energized, the polar contact 46 ismoved to its normal or first position, and so that when winding 36 isenergized, contact 40 is shifted to its reverse or second position. Theinternal construction of auxiliary relay Z is such that when both wind--ings are deenergized, the contact 40 will remain in its last operatedposition.

Contact 46 of relay Z has connected thereto a branch of wire 30 leadingfrom terminal B of,

battery 25. Contact 40 when in the normal or rfirst position, as shownin the drawing, engages normal polar contact 4| which is connected by afirst supply Wire 42 to movable contact 43 of relay RWP. Contact 43 whenpicked up engages a stationary contact to which is connected a branch ofwire 30 leading from terminal B of battery 25.

Contact 49 of auxiliary relay Z when in the reverse or second positionengages reverse polar contact 45 which is connected by a second supplywire 46 to contact 48 of relay NWP, while contact 48 when picked upengages a stationary contact to which is connected a branch of wire Billeading from terminal B of battery 25.

The switch repeating relay WP has a movable contact 50 which when pickedup engages a stationary contact 5| to which is connected a branch ofsecond supply wire 46. Contact 56 is connected by wire 52 to polarcontact 54 of relay WP, while contact 54 when in its normal position, asshown, engages a stationary contact 55 which is connected by wire 56 toone terminal of the winding of relay NWP. The other terminal of thewinding of relay NWP is connected by wire 58 to normal polar contact 59of switch control relay WR. Contact 59 of relay WR is engaged at timesby polar contact 66 whichis connected by wire 6| to neutral contact 63of relay WR. Contact 63 when picked up engages contact 64' to which isconnected a branch of wire 3! leading from terminal C of battery 25.

The switch repeating relay WP has, in addition, a neutral contact 66which when picked up engages a stationary contact 68 to which isconnected abranch of first supply wire 42, while the contact 66 isconnected by wire 39 to polar contact 10. Contact 16 when in its reverseposition engages a stationary contact H which is connected by a. wire 12to one terminal of the winding of relay RWP. The other terminal of thewinding of relay RWP is connected by wire 14 to reverse polar contact 15of relay WR, while contact 15 is engaged at times by polar contact ofrelay WR.

Contact 20 of lock relay LR, when released, engages a stationary contact18 which 'is connected'by wire l9 to contact of relay NWP. Contact 86,when picked up, engages a stationary contact to which is connected abranch of wire 30 leading from terminal B of battery 25, while contact86, when released, engages a stationary contact 8| which is connected bywire 83 to contact 84 of relay RWP. Contact 84, when picked up, engagesa stationary contact to which is connected a branch of wire 3| leadingfrom terminal C of battery 25.

Contact 2| of relay LR, when released, engages a stationary contact 82which is connected by wire 85 to contact 86 of relay NWP. Contact 86-,when picked up, engages a stationary contact to which is connected abranch of wire 3! leading from terminal C of battery 25, while contact86, when released, engages a stationary contact ,8! which is connectedby wire 39 to movable contact 90 of relay RWP. Contact 96, when pickedup, engages a stationary contact to which is connected a branch of wire39 leading from terminal B of battery 25.

The switch control relay WR has a neutral contact 92 which is connectedby wire 93 to a polar contact 95 of the relay WR. Contact 95, when inits normal position as shown, engages a normal stationary contact 95 towhich is connected a wire 97, while contact 95, when in its reverseposition, engages a reverse stationary contact 98 to which is connecteda wire 99. Neutral contact 92, when picked up, engages a stationarycontact N30 to which is connected a Wire 195, when picked up, engages astationary contact to which is connected a wire I91.

The relay RWP has a movable contact III] to which is connected a wireIII, while the contact H0, when picked up, engages a stationarycontactto which is connected a wire I I2.. The wires I06, I01, Ill and H2 arepart of circuits'for controlling the signals or other apparatus forgoverning the movement of trains over the track sec- 7 tion in which theswitch W is located.

The equipment is shown in the drawing in the position which it assumeswhen the switch W,

the. control lever Land the polar contacts of the switch control relayWR, the switch repeating relay WP, and of the auxiliary control relay Zare in their normal positions, and when the lock relay LR and the normalindication relay NWP are energized.

I As the switch W is, in its normal position, contact 21 engages thestationary contact to which is connected wire 30.1eading from terminal Bof battery-25, while contact 28 engages the stationary contact to whichis connected wire 3i leading from terminal C of battery 25. Accordinglycurrent of normal relative polarity is supplied to the winding of theswitch repeating relay WP and the neutral contacts of this relay arepicked up, while the polar contacts 54 and 10 are in their normalpositions as shown.

As the winding of the relayWP is energized with current of normalrelative polarity, the

' winding of the relay NWP is energized by current supplied from battery25. The energizing circuit for the Winding of relay NWP is traced fromterminal B of battery 25 through wire 39, contact 48 of relay NWP,second supply wire 46,

polar contacts 54- 55 of relay WP, wire 56, winding of relay NWP, wire58, normalpolar-contacts 59--69 of relay WR, wire 6 I, contacts 63-54 ofrelay WR, and wire 3| to terminal C of battery 25.

At this time as the winding of relay NWP is energized, the contacts ofthis relay are picked up and contact I05 is closed, and the circuit ofwhich wires I06 and I91 form a part is established topermit clearing ofthe signal or other apparatus controlled thereby.

As the polar contact 10 of relay WP is in the normal position, it doesnot engage contact H and the circuit of the winding of relay RWP,

' therefore, is interrupted and the contacts of relay RWP are released.Accordingly contact H ing 32 of relayv Z and wire 3| to terminalC ofbattery 25. As the winding 32 ofrelay Z is energized, polar contact 40is held in the normal or first position in engagement with contact 4|.As the lock relay LR is energized and as the control lever L is in thenormal position, circuits f are established to supply current of normalrelative polarity from battery I 4 to the winding of the switch controlrelay WE with the result that the neutral contacts of this relay arepicked up and the polar contacts of the relay are caused to occupy theirnormal positions as shown.

If at this time the operator wishes to eiiect movement of the switch Wfrom the normal to the reverse position, he may do so by moving thecontrol lever L from its normal to its reverse position. On thismovement of lever L, the contacts [0 and II are operated to efiect thesupply of current of reverse relative polarity from battery I4 tocontrol wires l6 and I1 and thus to the winding of relay WR. When thepolarity of the current supplied to this winding is reversed, theneutral contacts 63 and 92 become released and thereafter again becomepicked vup, while the polar contacts 60 and 95 are actuated from theirnormal to their reverse positions.

On release of the neutral contact 53 of relay WR and on movement ofpolar contact 66 away from the normal position out of engagement withcontact 59, the previously traced circuit for energizing the winding ofrelay NWP is interrupted, On deenegization of the winding of relay NWP,contact 34 becomes released, thereby interrupting the circuit forenergizing the first Winding 32 of relay Z. The internal construction ofthis relay Z is such, however, that on deenergization of winding 32,contact 40 remains in the position tact 4|.

On movement of contact 95 of relay WR from the normal to the reverseposition, the oonnec tion from wire IM to wire 91 is interrupted andwire I9! is now connected to wire 99. On completion of the circuitbetween wires Hll and 99, the apparatus controlling the motor for operating the switch W is caused to effect operation of the motor to producemovement of the switch W 1 from the normal to the reverse position.contacts l-5.6 of relay WP, wire 52, normal -When the switch -W movesaway from the normal position, contacts 21 and 28 are moved out ofengagement with the stationary contacts asenergizing the windings ofrelays NWP and RWP.

When the switch W attains the reverse position, contacts 2'! and 28' aremoved to their reverse positions so that contact 21 now engages astationary contact to which is connected a branch of wire 3| leadingfrom terminal C of battery 25, while contact 28 engages a stationarycontact to which is connected a branch of wire 39 leading from terminalB of battery 25. Accordingly, cur rent of reverse relative polarity issupplied to the winding of relay WP and the neutral contacts of thisrelay are picked up, while the polar contacts 54 and 10 are moved fromtheir normal to their reverse positions.

On movement of polar contact 19 of switch repeating relay WP to itsreverse position, it engages contact 'H, thereby establishing a pick-upcircuit for energizing the winding of relay RWP, This pick-up circuit istraced from terminal B of battery 25 through wire 36, contacts 404l ofauxiliary relay Z, first supply wire 42, contacts 6866 of relay WP, wire69, contacts EB-ll of relay WP, wire 12, winding of relay RWP, Wire 14,reverse polarcontacts 'l;5.60 of relay WR,

wire 6|, neutral contacts 6364 of relay WR, and wire 3| to terminal C ofbattery 25.

On picking up of the contacts of relay RWP, a stick circuit isestablished to maintain the winding of relay RWP energized aftermovement of contact 45 of auxiliary relay Z from its normal or firstposition to its reverse or second position.

This stick circuit is traced from wire 35 through contact 63 of relayRVW. to first supply wire 42 and thence to the winding of relay RWP overthe previously traced circuit including the contacts of relay WP.

On picking up of the contacts of relay RWP, contact 38 becomes closedand-establishes a circuit for energizing the second winding 36 ofauxiliary relay Z. This circuit is traced from wire 30 leading fromterminal B of battery 25 through contact 38 to wire '3! and thencethrough winding 36 to wire 3| leading from terminal C of battery 25. Aswinding 36 is energized, polar contact 40 of relay Z is shifted from itsnormal or first position to its reverse or second position.

On this movement of the contact 40 of relay Z, the pick-up circuit forrelay RWP is interrupted, but the winding of relay RWP continues to beenergized over the stick circuit established on picking up of its owncontact 43.

On picking up of the contacts of relay RWP, contact H5 is closed andcompletes the circuit between wires Ill and H2 to thereby permitclearing of the signal or other control apparat controlled by thiscircuit.

At this time as polar contact 54 of the switch repeating relay WP is inthe reverse position, the circuit of the winding of relay NWP isinterrupted and the contacts of this relay are released. Accordingly,contact I05 interrupts the connection between wires [06 and I! withtheresult that the signal or other control apparatus controlled by thiscircuit cannot be cleared.

The equipment operates in a similar manner in effecting movement of theswitch W from the reverse to the normal position. In order to effectmovement of the switch W to the normal position, the control lever L ismoved from its reverse to its normal position, thereby again effectingthe supply of current of normal relative polarity to the control wiresI6 and I1 and thus to the winding of relay WR.

On this reversal in the polarity of the current supplied to the windingof relay WR, the neutral contacts of this relay become released andthereafter again become picked up, while the polar contacts GI] and 95of this relay are shifted from their reverse to their normal postionswith the result that the control mechanism, not shown, for the motor,not shown, for the switch W is conditioned to effect operation of themotor to cause movement of the switch W from its reverse to its normalposition.

On release of contact 63 of relay WR the circuit for energizing thewinding of relay RWP is interrupted and the contacts of this relaybecome released. When contact 43 of relay lRWP is released the stickcircuit for energizing the relay winding is interrupted.

On movement of the switch W away from the reverse position, contacts2land 28 are moved out of engagement with the stationary contactsassociated therewith, thereby interrupting the circuit for energizingthe winding of relay WP. On deenergization of the winding'of relay WP,neutral contacts 50 and 66 become released, and the circuit forenergizing the winding of relay RWP is additionally interrupted bymovement of contact 66 out of engagement with contact 68, while contact50 interrupts the circuit for energizing the winding of relay NWP.

On deenergization of the winding of relay RVVP, its contacts becomereleased and contact no interrupts the circuit between wires ill and ll:to thereby prevent clearing of the signal or other mechanism controlledby this circuit.

In addition, on release of the contacts of relay RWP, contact 43 becomesreleased, thereby further interrupting the stick circuit for the windingof the relay RWP with the result that on subsequent picking up of thecontacts of relay WP, the circuit for the Winding of relay RWP is notcompleted. This will be true even though the neutral contact 66 of relayW'P should close before polar contact 70 is moved out of engagement withcontact H, since at this time no connection is established from wire 39leading from terminal B of battery 25 to first supply wire 42. This istrue since contact 43 of relay RWP is released, and since contact 46 ofrelay Z is in its reverse or second position. It will be seen,therefore, that on release of the contacts of relay RWP, this relaycannot thereafter again become energized until the polar contacts ofswitch repeating relay WP are picked up in their reverse positions andcontact 40 of auxiliary relay Z occupies its normal or first position asshown in the drawing.

On deenergization of the winding of relay RWP contact 38 is released andinterrupts the circuit of the second winding 36 of auxiliary relay Z. Aspreviously explained, however, after deenergization of this windingcontact 45 of the relay remains in the reverse or second position.

When the switch W reaches its normal position, contacts 21 and 28 againengage stationary contacts associated therewith to effect the supply ofcurrent of normal relative polarity to the winding of the switchrepeating relay WP and the neutral contacts of this relay become pickedup, while the polar contacts of the relay are shifted from their reverseto their normal positions.

On picking up of neutral contact t of relay WP and on movement of polarcontact'54 to its normal position into engagement with contact 55, acircuit is established for energizing the winding of relay NWP. Thiscircuit is traced from terminal B of battery 25 through wire 31 reversepolar contacts 4045 of relay Z, second supply wire 46, neutral contacts5!5t of relay WP, wire 52, normal polar contacts EAL-55 of relay WP andwire 56 to one terminal or the winding of relay NWP. The other terminalof the winding of relay NWP is connected through wire 58, normal polarcontacts 59-65 of relay WR, wire 6| and neutral contacts 6364 of relayWR to wire 3i leading from terminal C of battery 25.

On picking up of the contacts of relay NWP, contact 48 engages astationary contact to which is connected a branch of wire 36 to therebyestablish a stick circuit for the winding of relay NWP which maintainsthe relay winding energized after movement of contact 49 of auxiliaryrelay Z from its reverse to its normal position.

In addition, on picking up of the contacts of relay NWP, contact 34completes the previously traced circuit for energizing the first winding3 of relay Z, and on energization of winding 32 of relay Z, contact 40of the relay is shifted from its reverse to its normal position. As justpointed out, however, on this movement of contact it the winding ofrelay NWP remains energized by of battery 25.

current supplied over the stick circuit established by its own contact48.

On picking up of'the contacts of relay NWP, contact I05 again completesthe circuit between wires I06 and I01 to permit clearing of the signalor other apparatus controlled by this circuit.

The control system provided by this invention is arranged so that whenthe lock relay LR is deenergized, the connection from the control wiresl6 and IT to the winding of switch control relay WR is interrupted tothereby prevent a change in the polarity of the current supplied to thiswinding, While a circuit is established to maintain the winding of relayWR supplied with current of the same relative polarity as that withwhich it was supplied at the time the contacts' of relay LR becamereleased. 7

On deenergization of the winding of lock relay LR, contacts 20 and 2|become released, thereby interrupting connection from control wires [6and 1 1 to wires 22 and 23 leading to the winding of switch controlrelay WR, while contact 20 engages contact 18 and contact 21 engagescontact 82.

If at the time the contacts of the lock relay LR become released thewinding of switch control relay WR is supplied with current or normalrelative polarity, the polar contacts of the relay will be in theirnormal positions as shown in the drawing, at which time the switch Wwill also be in the normal position, while the normal indication relayNWP will be energized.

As the winding of relay NWP is energized, the contacts of this relay arepicked up and contact 80 will engage the stationary contact to which isconnected a branch of wire 30 leading from terminal B of battery 25,while contact 86 will engage a stationary contact to which is connecteda branch of wire 3| leading from terminal C As a result, current ofnormal relative polarity is supplied from battery 25 to the winding ofswitch control relay WR over a circuit which includes wire 30 leadingfrom terminal B of battery 25 through contact 80 of relay NWP, wire 19,contacts 18-20 of relay LR, wire 22, winding of switch control relay WR,wire 23, contacts 2l82 of relay LR, wire 85, contact 86 of relay NWP andwire 3| to terminal C of battery 25. I

As the switch control relay'WR continues to be supplied with current ofnormal relative polarity, the neutral contacts of this relay remainpicked up, while the polar contacts of the relay are caused to remain intheir normal positions, as shown, with the result that the apparatus forcontrolling the motor for operating the switch W continues to beconditioned to cause movement of the switch W to the normal position, orto cause it to remain in that position if it is already in suchposition.

In similar manner if when the contacts of the lock relay LR becomereleased the winding of switch control relay WR is supplied with currentof reverse relative polarity, circuits will be established to continuethe supply of current of this relative polarity to the winding of relayWR. When the winding of relay WR is supplied with current of reverserelative polarity, the polar contacts of this relay are in their reversepositions, and the switch W is also in its reverse position, while relayRWP is energized and relay NW'P is deenergized.

Accordingly, on release of contacts 20 and 2| of lock relay LR, acircuit is established to supply current of reverse relative polarityfrom battery 25 to winding of relay WR, while the connection fromcontrol wires I 6 and I! to the relay winding is interrupted.

The circuit for energizing the winding of relay WR is traced fromterminal B of battery 25 through wire 30, contact 90 of relay RW'P, wire89,

contacts Ill-86 of relay NWP, wire 85, contacts 82-2l of relay LR, wire23, winding of relay WR, wire 22, contacts 20'|8 of relay LR, wire 19,contacts 80-8! of relay NWP, wire 83, contact 84 of relay RWP and wire3| to terminal C of battery 25.

As the winding of the switch control relay WR continues to be suppliedwith current of reverse relative polarity, the neutral contacts of thisrelay remain picked up, while the polar contacts of the relay are heldin their reverse positions to condition the control apparatus for theswitch motor to move the switch W to the reverse position or to maintainit in such position.

The control system provided by this invention is arranged so that onmovement of the control lever L from one of its positions to the otherto efiect achange in the position occupied by the switch W, the switchmust complete its movement and must efiect energization of theindication relay for that position of the switch before the-indicationrelay for the other position of the switch can subsequently beenergized.

For purposes of illustration, it will be assume that the switch W is inthe normal position, and that an attempt is made to effect movement ofthe switch to the reverse position, but that the switch does notcomplete its movement to the reverse position.

In order to effect movement of the switch W from the normal to thereverse position, the control lever L is shifted from its normal to itsreverse position, thereby effecting the supply of current of reversepolarity to the winding of relay WR. On this change in the polarity ofthe current supplied to the winding of relay WR, the neutral contacts ofthe relay become released and then subsequently become picked up, whilethe polar contacts of this relay are shifted from their normal to theirreverse positions. On movement of contact 95 to the reverse'position,the apparatus for controlling the motor for operating the switch W isconditioned to effect movement of the switch W from the normal to thereverse position.

As a result of the momentary release of contact 63 and the movement ofcontact 60 of relay WR from the normal to the reverse position, thecircuit for energizing the winding of relay NWP is interrupted and thecontacts of this relay thereupon hecome released with the result thatcontact 48 interrupts the stick circuit for the relay winding, whilecontact I05 interrupts the circuit between wires I06 and I01.

On movement of the switch W away from the normal position, contacts 21and 28 are moved out of engagement with the stationary contactsassociated therewith, thereby interrupting the supply of current ofnormal relative polarity to the winding of switch repeating relay WPwith the result that the neutral contacts of this relay become released.

If movement of the switch W is obstructed, or if for "any other reasonthe switch does not complete its movement to the reverse position, thepolar contacts of relay WP will remain in their normal positions asshown and will maintain the circuit of the winding of relay RWPinterrupted, while connection from terminal B of battery 25 to thewinding of relay NWP remains interrupted since contact 40 of auxiliaryrelay Z is in the normal or first position as shown, while contact 48 ofrelay NWP is released.

If the control lever L is returned to the normal position before theswitch W has completed its movement to the reverse position, current ofnormal relative polarity will be supplied to the winding of switchcontrol relay WR and the polar contacts of this relay will be shiftedfrom their reverse to their normal positions, while contact 95 willcondition the control apparatus for the switch motor to effect operationof the motor to cause movement of the switch W from the reverse to thenormal position.

On movement of the polar contact 60 of switch control relay WR to thenormal position, a circuit is again established from wire 3| leadingfrom terminal C of battery 25 to wire 58 leading to one terminal of thewinding of the relay NWP.

When the switch W reaches the normal position, contacts 21 and 28 engagestationary contacts associated therewith to effect the supply of currentof normal relative polarity to the winding of the switch repeating-relay W'P with the result that the neutral contacts 58 and 66 of thisrelay again become picked up, while the polar contacts 54 and are heldin their normal positions as shown. However, at this time no circuit isestablished between wire 30 leading from terminal B of battery 25 andthe second supply wire 46 from which connection is established to oneterminal of the winding of relay NWP. This is true since polar contact40 of auxiliary relay Z remains in its normal or first position, whilecontact 48 of relay NWP is released.

Accordingly, relay NWP remains deenergized, while relay RWP is alsodeenergized since the circuit of the winding of this relay isinterrupted. by polar contact 60 of switch control relay WR as well asby polar contact 10 of relay WP. Both of the indication relays NWP andRWP are deenergized and the switch control circuits controlled by theserelays are interrupted with the result that all of the signalsassociated with the track stretch in which the switch W is locatedoccupy the stop position.

If the operator wishes to energize the normal indication relay NWP andthus permit clearing of the signals or other apparatus controlled bysuch relay, he may do so by first moving the control lever L to thereverse position and effecting movement of the switch W to the reverseposition.

On movement of the control lever L to the reverse position, current ofreverse relative polarity is supplied to the winding of relay WR andthis relay operates to condition the apparatus for controlling the motorfor the switch W to effect movement of the switch W from the normal tothe reverse position.

On movement of the switch W away from the normal position, contacts 21and 28 interrupt the circuit for supplying current of normal relativepolarity to the winding of switch repeating relay WP and the neutralcontacts of this relay thereupon become released. In order to effectmovement of the switch W to the reverse position, it may be necessary toremove the obstruction which previously prevented movement of the switchW to the reverse position, if such obstruction exists. When the switch Wreaches the reverse position, the contacts 21 and 28 establish circuitsfor supplying current of reverse relative polarity from the battery 25to the winding of relay WP and the neutral contacts of this relay areagain picked up, while the polar contacts 54 and H! are shifted fromtheir normal to their reverse positions.

On this movement of contact Hi, it engages contact H, thereby completingthe pick-up circuit for the winding of relay RWP, this circuit includingwire 30 leading from terminal B of battery 25, normal polar contacts404| of auxiliary relay Z, first supply wire 42, neutral contacts 5366of switch repeating relay WP, wire 69, reverse polar contacts 'l0ll,wire 12, winding of relay RWP, Wire l4, reverse polar contacts -450 ofrelay WR, wire 6!, neutral contacts 63-64 of relay WR. and wire 3| toterminal C of battery 25.

On picking up of the contacts of relay RWP, its contact 43 establishesthe stick circuit for the relay Winding, while contact 38 establishes acircuit for energizing the second winding 36 of auxiliary relay Z. Onenergization of winding 36 of relay Z, contact 40 of the relay isshifted from the normal to the reverse position, but on movement ofcontact 4|] out of engagement with contact 4i, the circuit forenergizing the winding of relay RWP is not interrupted since current isnow supplied to this winding over the stick circuit established bycontact 43.

After the switch W has completed its movement to the reverse positionand relay RWP has been energized, the operator may return the switch tothe normal position by returning the control lever L to the normalposition, thereby effecting the supply of current of normal relativepolarity to the winding of switch control relay WR. This relay thereuponoperates as previously described to effect movement of the switch W tothe normal position, while contacts 68 and 63 of relay WR operate tointerrupt the circuit of the winding of the relay RWP.

When the switch W moves away from the reverse position, contacts 27 and28 interrupt the circuit for energizing the winding of relay WP, andcontact 65 of this relay additionally interrupts the circuit of thewinding of the relay RWP. The contacts of relay RWP, therefore, becomereleased and contact 43 interrupts the stick circuit for the relaywinding so that on subsequent picking up of contact 56 of relay WP, thewinding of relay RWP will not again be energized.

When the switch W attains the normal position, contacts 21 and 28 effectthe supply of current of n rmal relative polarity to the winding ofswitch repeating relay WP, and since contact 40 of auxiliary relay Z isnow in the reverse or second position, in which it engages contact 45 towhich is connected the second supply wire 46, the contacts of relay WPestablish the pick-up circuit for the winding of relay NWP as previouslytraced in detail. As the winding of relay NWP is energized its contact48 establishes the stick circuit for the relay winding, while contact 35completes the circuit between signal control wires I66 and I01.

The apparatus operates in a similar manner if, when the switch W is inthe reverse position, the operator moves the control lever L away fromits reverse position towards the normal position, and thereafter returnsit to the reverse position before the switch W has completed itsmovement to the normal position.

When the switch W is in the reverse position, relays WR and WP areenergized with current of reverse relative polarity, while relay RWP isenergized and contact 48 of auxiliary relay Z is in the reverse orsecond position.

On movement of the control lever L away from the reverse position, thecircuit for energizing the winding of relay WR is interrupted and theneutral contacts of this relay thereupon become released. When contact63 is released, the circuit for energizing the winding of relay RWP isinterrupted and contact 43 of this relayis released to interrupt thestick circuit for maintaining the relay winding energized.

On movement of the switch W away from the reverse position, if suchmovement takes place, contacts 27 and 28 are operated to interrupt thesupply of current of reverse relative polarity to the winding of switchrepeating relay WP and the neutral contacts of this relay thereuponbecome released and additionally interrupt the circult of the winding ofrelay RWP.

If the control lever L is now returned to the reverse positionbefore-the switch W reaches the normal position, current of reverserelative polarity will again be supplied to the winding of switchcontrol relay WR and neutral contact 63 of this relay will again becomepicked up, while the polar contacts of the relay will remain in theirreverse positions or will be returned to the reverse position if theyhave been moved therefrom, and will condition the motor controlapparatus to effect operation of the motor to return the switch W to thereverse position if it is notalready in that position.

On picking up of the contact 63 of relay WR, the circuit from wire 3|leading from terminal C of battery 25 is again completed to wire 14leading to one terminal of the winding of relay RWP. However, at thistime no connection is established from the other terminal of the windingof relay RWP to terminal B of battery 25 since contact 453 of auxiliaryrelay Z is in its reverse position, and therefore does not engage thecontact 45, while contact 43 of relay RWP is release-:3. Accordingly,the winding of relay RVVP does not become energized on picking up of thecontacts of relay WR or upon picking up of the neutral contacts of relayWP, which occurs when the switch W reaches the reverse position.

If the operator wishes to energize the reverse indication relay RWP andthus permit clearing of the signals or other apparatus controlled bysuch relay, he may do so by first moving the control lever L to thenormal position. thereby conditioning the switch control relay W'R tocause the switch motor to move the switch W to the normal position. As aresult of this operation of switch control relay WR, contact 69interrupts the circuit of the winding of relay RWP and again establishesa circuit from wire 3! to wire 58 leading to one terminal of the windingof relay NWP.

When the switch W reaches the normal position, contacts 21 and 28 againeffect the supply of current of normal relative polarity to the Windingof switch repeating relay WP, and the contacts of this relay becomepicked up to establish the pick-up circuit for the winding of relay NWP.

On picking up of the contacts of relay NWP, contact 34 completes thecircuit for the first winding 32 of auxiliary relay Z, and on energize,-tion of winding 32, contact 40 is shifted from the reverse or secondposition to the normal or first position in which it engages contact 4|so that on subsequent energization of the winding of relay WP withcurrent of reverse relative polarity, which occurs on movement of switchW to the reverse position, the pick-up circuit for the winding of relayRWP will be complete.

From. the foregoing, it will be seen that the control system provided bythis invention incorporates a polarized auxiliary relay Z whichfunctions to provide the same operating results as has heretofore beenprovided by the quick switch mechanism.

In addition it will be seen that the system has the further advantagethat it does not at any time prevent movement of the switch between itstwo positions. The eifect of the system on movement of the switchcontrol lever away from either of its positions and return to thatposition before the switch completes its movement is to cause both ofthe indication relays to be deenergized and thereby prevent clearing ofthe signals or other control apparatus controlled by these relays.

As the operator retains control of the switch and can effect movementthereof between its two positions he may repeatedly reverse the switchand thus break down an obstruction to movement of the switch, if suchexists, and thus make it possible for the switch to complete itsmovement and effect energizationof one of the indication relays andthereby restore the apparatus to its normal condition.

In applicants system on movement of the switch control lever away fromeither of its positions, the circuit for energizing the indication relayfor that position of the switch is interrupted and cannot thereafter bereestablished until the switch has been moved to its other position andthe indication relay for such other position energized. When this hastaken place, the switch W can be returned to its original position andon its return, the indication relay for that position will becomeenergized.

Referring to Fig. 2 of the drawing, I have illustrated therein amodification which may be employed to provide additional insurance thatthe windings of the indication relays NWP and RWP can only be energizedif the polar contacts' of the switch repeating relay WP and of theauxiliary relay Z are in correspondence with each other and with theposition occupied by the switch W.

The system shown in Fig. 2 is the same as that shown in Fig. 1 except ashereinafter pointed out in detail. In the system shown in Fig. 2,contact 48 of auxiliary relay Z, instead of being directly connected toterminal B of battery 25, is connected thereto by a circuit controlledby the relay WP and by th switch operated contacts.

Referring to the drawing, in the system shown in Fig. 2, contact 40 ofauxiliary relay Z is connected by wire l2!) to a neutral contact IZI ofrelay WP. Contact I2 I, when picked up, engages a stationary contact I22which is connected by wire I24 to polar contact I25 of relay WP. ContactI25, when in the normal position as shown, engages a stationary contactI21 to which is connected a branch of the wire leading from switchoperated contact 21. Contact I25, when in the reverse position, engagesa stationary contact I28 to which is connected a branch of the wireleading from switch operated contact 28.

When the switch W is in the normal position, contacts 2'! and 28 are inthe positions shown, that is contact 21 engages a stationary contact towhich is connected a branch of wire 30 leading from terminal B ofbattery 25, while contact 28 engages a stationary contact to which isconnected a branch of wire 3| leading from terminal C of battery 25.With the contacts 21 and 28 in these positions current of normalrelative soi polarity is supplied to the winding of relay WP and theneutral contacts of this relay are picked up, while the polar contactsof the relay are held in their normal positions.

Accordingly, at this time contact 40 of auxiliary relay Z is connectedto terminal B of bat tery over a circuit which includes wire I20,contacts I2I-I22 of relay WP, wire I24, normal polarcontacts I25--I2I ofrelay WP, switch operated contact 21 and wire 38.

As explained in detail in connection with the system shown in Fig. 1, atthe time the switch W is moved to the normal position contact 48 ofrelay Z is in the reverse position in which it engages contact 45 towhich is connected the second supply wire 46. Accordingly, on movementof the switch W to the normal position with resultant operation of thecontacts 21 and 28 to eiiect the supply of current of normal relativepolarity to winding of relay WP, the contact 48 of auxiliary relay Zestablishes connection from terminal B of battery 25 to the secondsupply wire 46 so that the win-ding of relay NWP may become energized.

Similarly, on movement of the switch W to the reverse position thecontacts 21 and 28 are shifted so that contact 2'! now engages astationary contact to which is connected a branch of wire 3I leadingfrom terminal C of battery 25, while contact 28 now engages a stationarycontact to which is connected a branch of wire 38 leading from terminalB of battery 25; Current of reverse relative polarity is, therefore,supplied to the winding of relay WP and the neutral contacts of thisrelay will be picked up, while the polar contacts of the relay will bemoved to their reverse positions. On movement of contact I25 to thereverse position it engages reverse polar contact I 28 which at thistime is connected by switch operated contact 28 to terminal B of battery25. Connection is established, therefore, from terminal B of battery 25to contact 48 of auxiliary relay Z, the circuit being traced from wire30 leading from terminal B of battery 25 through switch operated contact28, reverse polar contacts I28-I25 of relay WP, wire I24, contactsI22I2I of relay WP, and wire I20 to contact 48.

When the switch W is in the normal position, contact 45! of auxiliaryrelay Z is caused to ocicupy the normal position as shown, as explainedin detail in connection with the system shown in Fig. 1. Accordingly,when the switch W is moved to the reverse position and the winding ofrelay WP is supplied with current of reverse relative polarity and itspolar contacts shift to their reverse position, contact 40 establishesconnection from terminal B of battery 25 to the first supply wire 52from which connection is established to energize the winding of relayRWP.

The modification shown in Fig. 2 operates so that if for any reason onmovement of the switch W from one of its positions to the other, thepolar contacts of relay WP fail to move to the corresponding position,contact 48 of auxiliary relay Z will not be connected to terminal B ofbattery 25, but will be connected to terminal C of the battery, if thecontact is not completely disconnected therefrom.

If, for example, the switch W is being moved from the normal position tothe reverse position and the polar contacts of relay WP remain in theirnormal positions after switch W attains the reverse position, contactI25 will engage contact I21 which is connected to switch operatedcontact 21. In the reverse position of the switch W contact 21 engages astationary contact to which is connected a branch of wire 3| leadingfrom terminal C of battery 25. Accordingly, if the circuit leading tocontact 48 of relay Z is not interrupted by contact I2I of relay WP,contact 48 will be connected to terminal C of battery 25, and not toterminal B. Contact 48 is connected to terminal B only if the polarcontacts of relay WP are in correspondence with the switch operatedcontacts 2'! and 28.

Similarly, if the switch W is moved from the reverse to the normalposition and the polar contacts of relay WP fail to move to their normalpositions, but remain in their reverse positions, connection will not beestablished between contact 48 of relay Z and terminal B of battery 25,and contact 48, if connected to either terminal of battery 25, will beconnected to terminal C of the battery. When the polar contact I25 ofrelay WP is in the reverse position it engages contact I28 which isconnected to switch operated contact 28, while contact 28, in the normalposition of the switch W, engages a stationary contact to which isconnected a branch of wire 31 leading from terminal C of battery 25.

From the foregoing it is clear that in the modification shown in Fig. 2contact 48 of auxiliary relay Z is not connected to terminal B ofbattery 25 unless there is correspondence between the positions of theswitch operated contacts and the polar contacts of relay WP.Accordingly, at times when the polar contacts of relay WP are out ofcorrespondence with the switch operated contacts 2'! and 28, connectioncannot be established by contact 48 of auxiliary relay Z from terminal Bof battery 25 to either the first supply Wire 42 or the second supplywire 46, and hence the pick-up circuits for theindication relays NWP andRWP cannot be established. Both of these relays, therefore, will remaindeenergized and there is no possibility that a false clear indicationwill be given.

The system shown in Fig. 1 normally operates to prevent energization ofeither indication relay unless the relay WP operates in the intendedmanner. Thus it will be seen that when the switch W is in the normalposition, relay NWP is energized and its contact 34 establishes thecircuit for the first winding 32 of relay Z, while winding 32, whenenergized, effects movement of contact 40 to the normal or firstposition in which it engages contact II to which is connected the firstsupply wire 42.

If the switch W is now moved away from the normal position, the circuitof the winding of relay NWP is interrupted by the contacts of relay WR,while on release of the contacts of relay NWP its own contact 48interrupts the stick circuit for energizing its own winding. When theswitch W reaches the reverse position, the polar contacts of relay WPnormally shift to their reverse positions, but even if they shouldremain in the normal position and the neutral contacts of the relayshould remain picked up, a circuit would not be established to energizeeither of the indication relays. This would be true since contact E8 ofrelay WP, when in the normal position, does not engage contact II, andhence does not establish'the pick-up circuit for relay RWP, and whilecontact 54 of relay WP, when in the normal position, engages contact 55,the pick-up circuit for relay NWP is not complete since contact 48 ofrelay Z is out of engagement with contact 45.

The system operates in a similar manner if on movement of the switch Wfrom the reverse to the normal position the polarcontacts of relay WPfail to shift to the normal position and remain in the reverse positioninstead. Under these circumstances neither indication relay isenergized.

In the system shown in Fig. lot the drawing, however, if there should bea simultaneous failure ofthe relays WP and Z to operate as intended,there is a possibility that one of the indication relays might beenergized at a time when it should not be.

For example, when the switch W is in the normal position, the relay NWPis energized and its contact 34 establishes the circuit for the firstwinding 32 of auxiliary relay Z. Winding 32 should now be energized andcontact 40 should move from the reverse or second position tothe normalor first position.- For purposes of illustration it is assumed thatrelay Z does not operate as intendedand that contact '40 of the relayremains in the reverse position in engagement with contact 45.

If the switch W is now moved to the reverse position, the circuit of thewinding of relay NWP will beinterrupted by the contacts of relay WR.When the switch reaches the reverse position, the polar contacts ofrelay WP should move from the'normal to the reverse position. Forpurposes of illustration, it is-assumed, however, that the relay WPfails to operate as intended, and that the polar contacts of the relayWP remain in their normal positions and'that the neutral contacts of therelay remain picked up. As a result of this simultaneous failure of therelays WP and Z'to operate in the intended manner, a circuit isestablished from-wire 30 leadingfrom terminal B of battery 25 to oneterminal of the winding of relayNWP.

As long as the relay WRcontinues tobe supplied with curren'tof reverserelative polarity and its polar contacts remain in their reversepositions, no connection is established from the other terminal of thewinding of relay NWP to terminal C of battery 25, and the winding,therefore, remains deenergized.

However, on subsequent supply of current of normal relative polarity tothe relay WR, and resultant movement of the polar contacts of this relayto their normal positions to effect corresponding movement of the switchW, the circuit from terminal C of battery to wire 58 leading to aterminal of the winding of relay NWP is complete. its connection isestablished between the other terminal-of the winding of relay NWP andterminal B of battery 25 at this time due to faulty operation of relaysWP and Z, as explained above, the winding of relay NWP will beenergiz'ed immediately upon movement of the polar contacts of relay WRto their normal positions. The relay NWP, therefore, would be energizedand would permit clearing of the signals controlled thereby even thoughthe switch W has not reached the normal position, and, if movement ofthe switch were obstructed, might not I it engages contact 4|, and ifthere should be a simultaneous failure of the relay WP so that its polarcontacts stick in their reverse positions. Under these circumstances, onmovement of the polarcon'tacts of relay WR to their reverse positionsthe winding of relay RWP will be energized even though the switch W isnot in the reverse position and may not reach-that position.

The modification shown in Fig. 2 of the drawing is arranged to preventenergization of the relays NWP and RWP in the event of simultaneousfailure of the relays WP and Z.

As previously explained in detail, in the system shown in Fig 2, contactof relay Z is'connectd to terminal B of battery 25 only when thepositions of the polar contacts of relay WP corre-' spond to theposition of the switch W. When the switch W and the contacts of relay WPare out of correspondence, contact 40 of auxiliary relay Z is connectedto terminal C of battery 25, if any circuitis established to thiscontact.

Accordingly, if because of faulty operation of relays WP and Z,connection is established to one terminal of the winding of relay NWP orRWP at a time when this connection should not be made, no objectionableresults will follow. Under such circumstances, on operation of relay WRto complete the circuit leading from the other terminal of the windingof either of the indication relays, both terminals of the relay windingwill be connected to terminal 0 of battery 25, and the winding,therefore, will not be energized, while the signal or other apparatuscontrolled by the relay cannot assume the clear condition.

From the foregoing it will be seen that the modification shown in Fig. 2of the drawing provides means to prevent undesired energization of theindication relays in the event of simultaneous failure of the relays WPand Z.

Although I have herein shown and described one form of apparatusembodyingmy invention, together with a modification which I may employ,it is understood that various changes and modifications may be madetherein within the scope of the appended claims without departing fromthe spirit and scopeof my invention.

Having thus described my invention, what I claim is:

1. In combination, a railway track switch movable between a normal and areverse position, means for eifecting movement of said switch betweenits two positions, a normal indication de-' vice and a reverseindication device, a source of current, an auxiliary device controlledby said indication relays, said auxiliary device having an elementmovable between a first position in which it establishes connection fromsaid source of current to a first supply circuit and a second positionin which it establishes connectionfrom said source of current to asecond supply circuit, the normal indication device being operative whenenergized to eifect movement of said auxiliary deviceelement to itsfirst position, the reverse indication device being operative whenenergized to effect movement of the auxiliary device element to itssecond position, a member movable in accordance with movement of theswitch, said member being operative when and only when the switchis inthe normal position to effect connection from the second supply circuitto the winding of the normal indication device and being operative whenand only when the switch is in the reverse position to effect connectionfrom'the first supply circuit tothe winding of the reverse indicationdevice, said indication devices controlling means for governing movementof trains across said switch.

2. In combination, a railway track switch movable between a normal andareverse position, a motor for moving said switch between its twopositlons, a control device having a normal c'ondi tion in which iteffects operation of the motor to move the switch to the normal positionand also having a reverse condition in which it eifects operation of themotor to move the switch to the reverse position, means for selectivelycausing said control device to assume one or the other of itsconditions, a normal indication relay and a reverse indication relay, 2.source of current, an

auxiliary device controlled by said indication relays, said auxiliarydevice having an element movable between a first position in which itestablishes connection from said source of current to a first supplycircuit and a second position in which it establishes connection fromsaid source of current to a second supply circuit, the normal indicationrelay being operative when energized to effect movement of saidauxiliary device element to its first position, the reverse indicationrelay being operative when energized toeffect movement of the auxiliarydevice element to its; second position, a member movable in accordancewith movement of the switch, said member being operative when and onlywhen the switch is in the normal position to effect connection from thesecond supply circuit to the winding of the normal indication relay andbeing operative when and only when the switch is in the reverse positionto efifect connection from the first supplycircuit to the winding of thereverse indication relay, said control device also controlling thecircuits of the indication relays, said control de vice being operativewhen and only when in its normal condition to establish the circuit ofthe normal indication relay and being operative when and only when inits reverse condition to establish the circuit of the reverse indicationrelay.

3. In combination, a railway track switch movable between a normal and areverse position, means for effecting movement of said switch betweenits two positions, a normal indication relay and a reverse indicationrelay, a source of current, an auxiliary device controlled by saidindication relays, said auxiliary device having an element movablebetween a first position in which it establishes connection from saidsource of current to a first supply circuit and a second position inwhich it establishes connection from said source of current to a secondsupply circuit, the normal indication relay being operative whenenergized to effect movement of said auxiliary device element to itsfirst position, the reverse indication relay being operative whenenergized to effect movement of the auxiliary device element to itssecond position, the auxiliary device element being adapted on movementto either of its positions to remain in such position until caused tomove therefrom by one of said indication relays, a member movable inaccordance with movement of the switch, said member being operative whenand only when the switch is in the normal position to effect connectionfrom the second supply circuit to the winding of the normal indicationrelay and being operative when and only when the switch is in thereverse position to effect connection from the first supply circuit tothe winding of the reverse indication relay.

' 4. In combination, a railway track switch movable between a normal anda reverse position, means for effecting movement of said switch betweenits two positions, a normal indication relay and a reverse indicationrelay, a source of current, an auxiliary device controlled by saidindication relays, said auxiliary device having an element movablebetween a first position in which it establishes connection from saidsource of current to a first supply circuit and a second position inwhich it establishes connection from said source of current to a secondsupply circuit, the normal indication relay being operative whenenergized to effect movement of said auxiliary device element to itsfirst position, the reverse indication relay being operative whenenergized to effect movement of the auxiliary device element to itssecond position, a member movable in accordance with movement of theswitch, said member being operative when and only when the switch is inthe normal position to eiiect connection from the second supply circuitto the winding of the normal indication relay and being operative Whenand only when the switch is in the reverse position to effect connectionfrom the first supply circuit to the winding of the reverse indicationrelay, and circuits controlled by said indication relays and adapted tocontrol means for governing movement of trains across said switch.

5. In combination, a railway track switch movable between a normal and areverse position, means for efi'ecting movement of said switch betweenits two positions, a source of current, an auxiliary relay having afirst and a second winding and having an element movable between a firstand a second position by said windings, said element being movable toits first position when the first winding is energized and beingoperative in said first position to eiiect connection from said sourceof current to a first supply circuit, said element being movable to itssecond position when the second winding is energized and being operativein said second position to eifect connection from said source of currentto a second supply circuit, a normal and a reverse indication relay, thenormal indication relay being operative when energized to efiectconnection from said source of current to said second supply circuit andto effect the supply of current to the first winding of said auxiliaryrelay, the reverse indication relay being operative when energized toeffect connection, from said source of current to said first supplycircuit and to effect the supply of current to the second winding ofsaid auxiliary relay, a member movable in accordance with movement ofthe switch, said member being operative when and only when the switch isin the normal position to effect connection from the second supplycircuit to the winding of the normal indication relay and beingoperative when and only when the switch is in the reverse position toefiect connection from the first supply circuit to the winding of thereverse indication relay, and circuits controlled by said indicationrelays and adapted to control means for governing movement of trafficacross said switch. y

6. In combination, a railway track switch movable between a normal and areverse position, a motor for moving said switch between its twopositions, a control device having a normal condition in which iteffects operation of the motor to move the switch to the normal positionand having a reverse condition in which it effects operation of themotor to move the switch to the reverse position, means for selectivelycausing said control device to assume one or the other of itsconditions, a source of current, an auxiliary relay having a first and asecond winding and having an element movable between a first and asecond position by said windings, said element being movable to itsfirst position when the first winding isenergized and" being operativein said first position to effect connection from said source of currentto a first supply circuit, said element being movable to its secondposition when the second winding is energized and being operative insaid second position to effect connection from said source of current toa second circuit, a normal: and a reverse indication relay, the normalindication relay being operative when energized to effect connectionfrom said source of current to said second supply circuit and to effectthe supply of current to the first winding of said auxiliary relay, thereverse indication relay being operative when energized to effectconnection -5 from said source of current to said first supply circuitand to effect the supply of current to the second winding of saidauxiliary relay, amember movable in accordance with movement of theswitch, said member being operative when mal condition to establish thecircuit of the normal indication relay and being operative when and onlywhen in its reverse condition to establish the circuit of the reverseindication relay.

7. In combination, a railwaytrack switch movable between a normal and areverse position,

means for moving said switch between its two positions, an auxiliaryrelay having a first and .a-second windingand having an element movablebetween a first and a second position by said windings, said elementbeing moved to the first position on energization of the first windingand being moved to the second position on energizationof the secondwinding, a normal and a reverse indication relay, a movable membermovable'between a normal and a reverse position in accordance withmovement of the switch, means operable when the auxiliary relay elementis in its first position and the movable member is in I the reverseposition to energize the reverse inindication relay being operative whenenergized dication relay, means operable when the auxiliary relayelement is in its second position and. the movable member is in itsnormal position to energize the normal indication relay, the normalindication relay being operative when energized and the movable memberis in its normal position to establish a stick circuit for energizingits own winding, the reverse indication relay being operative whenenergized and the movable memher is in its reverse position to establisha stick circuit for energizing its own-winding, the normal to establisha circuit for energizing the first winding of the auxiliary relay, andthe reverse indication relay being operative when energized to@establish a circuit for energizing the second winding ofthe auxiliaryrelay.

8. In combinatioma railway track switch mov-, able, between a normal anda reverse position, means for moving said switch between its two 1positions, anauxiliary relay having a first and a second winding andhaving an element movable between a first and asecond position by saidwindings, said element being moved to the first position on energizationof the first winding and being moved to the second position onenergize;-

tion of the second winding, a normal and a re-' verse indication relay,a movable member movable between a normal and a reverse position inaccordance with movement of the switch, means operable when theauxiliary relay element is in its first position and the movable memberis in the reverse position to energize the reverse indicationrelay,means operable when the auxiliary relay element is in its secondposition and the movable member is in its normal position to energizethe normal indication relay, the normal indication relay being operativewhen energized and the movable member is in its normal position to:establish a stick circuit for energizing its own winding, the reverseindication relay being operative when energized and the movable memberis in its reverse position to establish a stick circuit for energizingits own winding, the normal indication relay being operative whenenergized toestablisha circuit for energizing the first winding of theauxiliary relay and the reverse indication relay' being operative whenenergized to establish a circuit for energizing the second winding ofthe auxiliary relay, and circuits controlled by said normal and reverseindication relays and adapted to control means for governing movement oftrains over the track switch.

9. In combination, a railway track switch movable between a normal and areverse position, means for moving said switch between its twopositions, an auxiliary device having a first condition and a secondcondition, a normal and a reverse indication relay, a movable membermovable between a normal and a reverse position in accordance withmovement of the switch, means operable when the auxiliary device is inits first condition and the movable member is in the reverse position toenergize the reverse indication relay, means operable when the auxiliarydevice is in its second condition and the movable member is in thenormal position to energize the normal indication relay, the normalindication relay being operative when energized and the movable memberis in the normal position to establish a stick circuit for energizingits own winding, the reverse indication relay being operative whenenergized and the movable member is in the reverse position to establisha stick circuit for energizing its own winding, the normal indicationrelay being operative when energized to cause the auxiliary device toassume its first condition, and the reverse indication relay beingoperative when energized to cause the auxiliary device to assume itssecond condition.

10. In combination, a railway track switch movable between a normal anda reverse position, means for moving said switch between its twopositions, an auxiliary device having a first condition and a secondcondition, a normal and a reverse indication relay, a movable membermovable between a normal and a reverse position in accordance withmovement of the switch, means operable when the auxiliary device is inits first condition and the movable member is in the reverse position toenergize the reverse indicationrelay, means operable when the auxiliary"device is in its second condition and the movable member is in thenormal position to energize the normal indication relay, the normalindication relay being operative when energized and the movable memberis in the normal position to establish a stick circuit for energizingits own winding, the reverse indication relaybeing operative whenenergized and the movable member is in" the-reverse position toestablish-a stick circuit for energizing its own winding, the normalindication relay being operative when energized to cause the auxiliarydevice to assume its first condition and the reverse indication relaybeing operative when energized to cause the auxiliary device to assumeits second condition,

and circuits controlled by said normal and reverse indication relays andadapted to control means for governing movement of trains over the trackswitch.

11. In combination, a railway track switch movable between a normal anda reverse position, an auxiliary device having a first condition and asecond condition, a nomal and a reverse indication relay, a membermovable between a normal and a reverse position in accordance withmovement of the switch, means operable when the auxiliary device is inits first condition and the movable member is in the reverse position toenergize the reverse indication relay, means operable when the auxiliarydevice is in its second condition and the movable member is in thenormal position to energize the normal indication relay, the normalindication relay being oper- 'ative when energized and the movablemember is in the normal position to establish a stick circuit forenergizing its own winding, the reverse indication relay being operativewhen energized and the movable member is in the reverse position toestablish a stick circuit for energizing its own winding, the normalindication relay being operative when energized to cause the auxiliarydevice to assume its first condition, and the reverse indication relaybeing operative when, energized to cause the auxiliary device to assumethe second condition, a control mechanism having a normal position inwhich it efiects movement of the switch to the normal position andhaving a reverse position in which it effects movement of the switch tothe reverse position, the control mechanism also controlling thecircuits of the windings of the normal and reverse indication relays,said control mechanism being operable when and only when in its normalcondition to establish the circuit of the normal indication relay andbeing operable when and only when in its reverse condition to establishthe circuit of the reverse indication relay.

12. In combination, a railway track switch ,movable between a normal anda reverse position,

an auxiliary device having a first condition and a second condition, anormal and a reverse indication relay, a member movable between a normaland a reverse position in accordance with movement of the switch, meansoperable when the auxiliary device is in its first condition and themovable member is in the reverse position to energize the reverseindication relay, means operable when the auxiliary device is in itssecond condition and the movable member is in the normal position toenergize the normal indication relay, the normal indication relay beingoperative when energized and the movable member is in the normalposition to establish a stick circuit for energizing its own winding,the reverse indication relay being operative when energized and themovable member is in the reverse position to establish a stick circuitfor energizing its own winding, the normal indication relay beingoperative when energized to cause the auxiliary device to assume itsfirst condition and the reverse indication relay being operative whenenergized to cause the auxiliary device to assume the second condition,a polarized relay operative when energized with current of normalrelative, polarity to eliect movement of the switch to the normalposition and being operative when energized with current of reverserelative polarity to effect movement of the switch to the reverseposition, said polarized relay also controlling the circuits of thenormal and reverse indication relays, said polarized relay beingoperative when and only when energized with current of normal relativepolarity to establish the circuit of the normal indication relay andbeing operative when and only when energized with current of reverserelative polarity to establish the circuit of the reverse indicationrelay, and means for selectively supplying current of one polarity orthe other to said polarized relay.

13. In combination, a railway track switch' movable between a normal anda reverse position, means for moving said switch between said positions,an auxiliary device having a first condition and a second condition, apolarized relay, means operative when and only when the switch is in thenormal position for supplying current of normal relative polarity tosaid polarized relay, means operative when and only when the switch isin the reverse position for supplying current of reverse relativepolarity to said polarized relay, a normal and a reverse indicationrelay, means operable when the auxiliary device is in its firstcondition and the polarized relay is supplied with current of reversepolarity to establish a circuit for energizing the reverse indicationrelay, means operable when the auxiliary device is in its secandcondition and the polarized relay is supplied with current of normalpolarity for energizing the normal indication relay, the reverseindication relay being operative when energized and the polarized relayis supplied with current of reverse relative polarity to establish astick circuit for energizing its own winding, the normal indicationrelay being operative when energized and the polarized relay is suppliedwith current of normal relative polarity to establish a stick circuitfor energizing its own winding, the normal indication relay beingoperative when energized to cause the auxiliary device to assume itsfirst condition, the reverse indication relay being operative whenenergized to cause the auxiliary device to assume its second condition.

i l. In combination, a railway track switch movable between a normal anda reverse position, means for moving said switch between said positions,an auxiliary device having a first condition and a second condition, apolarized relay, means operative when and only when the switch is in thenormal position for supplying current of normal relative polarity tosaid polarized relay, means operative when and only when the switch isin the reverse position for supplying current of reverse relativepolarity to said polarized relay, a normal and a reverse indicationrelay, means operable when the auxiliary device is in its firstcondition and the polarized relay is supplied with current of reversepolarity to establish a circuit for energizing the reverse indicationrelay, means operable when the auxiliary device is in its secondcondition and the polarized relay is supplied wtih current of normalpolarity for energizing the normal indication relay, the reverseindication r lay being operative when energized and the polarized relayis supplied with current of reverse relative polarity to establish astick circuit for energizing its own winding, the normal indicationrelay being operative when energized and the polarized relay is suppliedwith currentof normal relative polarity to establish a stick circuit forenergizing its own winding, the normal indication relay being operativewhen energized to cause the auxiliary device to assume its first con-;dition, the reverse indication relay being operative when energized tocause the auxiliary device to assume its second condition, and circuitscontrolled by said normal and reverse indication relays and adapted tocontrol means for governing movement of trains over the track switch.

15. In combination, a railway track switch movable between a normal anda reverse position, means for moving said switch between said positions,an auxiliary device having a first condition and a second condition, apolarized relay, means operative when and only when the switch is in thenormal position for supplying current of normal relative polarity tosaid polarized relay, means operative when and only when the switch isin the reverse position for supplying current of reverse relativepolarity to said polarized relay, a normal and a reverse indicationrelay, means operable when the auxiliary device is in its firstcondition and the polarized relay is supplied with current of reversepolarity to establish a circuit for energizing the reverseindicationrelay, means operable when the auxiliary device is in its secondcondition and the polarized relay is supplied with current of normalpolarity for energizing the normal indication relay, the reverseindication relay being operative when energized and the polarized relayis supplied with current of reverse relative polarity to establish astick circuit for energizing its own winding, the normal indicationrelay being operative when energized and the polarized relay is suppliedwith current of normal relative polarity to establish a stick circuitforlenergizing its own winding, the normal indication relay beingoperative when energized to cause the auxiliary device to assume itsfirst condition, the reverse indication relay being operative whenenergized to cause the auxiliary'device to assume its second condition,a control mechanism having a normal position in which it effectsmovement of the switch to the normal position and having a reverseposition in which it effects movement of the switch to the reverseposition, the control mechanism also controlling the circuits of thewindings of the normal and reverse indication relays, said controlmechanism being operable when and only when in its normal condition toestablish the circuit of the normal indication relay and being operablewhen and only when in its reverse condition to establish the cir cuit ofthe reverse indication relay.

16. In combination, a railway track switch movable between a normal anda reverse position, means for moving said switch between its twopositions, an auxiliary device having a first condition and a secondcondition, a normal and a reverse indication relay, a movable membermovable between a normal and a reverse position in accordance withmovement of the switch, means operable when the auxiliary device is inits first condition and the movable member is in the reverse position toenergize the reverse indication relay, means operable when the auxiliarydevice is in its second condition and the movable member is in thenormal position to energize the normal indication relay, the normalindication relay being operative when energized and the movable memberis in the normal position to establish a stick circuit for energizingits own winding, the reverse indication relay being operative whenenergized and the movable member is in the reverse position to establisha stick circuit for energizing its own winding, the normal indicationrelay being operative when energized to cause the auxiliary device toassume its first condition and the reverse indication relay beingoperative when energized to cause the auxiliary device to assume thesecond condition, a polarized relay operative when and only whenenergized with current of normal relative polarity to effect movement ofthe switch to the normal position and to establish the circuit of thewinding of the normal indication relay, said polarized relay beingoperative when and only when energized with current of reverse relativepolarity to effect movement of the switch to the reverse position and toestablish the circuit of the winding of the reverse indication relay,and a lock relay governed by traific conditions in the vicinity of theswitch, said lock relay being operative when energized to connect thewinding of the polarized relay to a control circuit through whichcurrent of one or the other polarity may be selectively supplied to saidrelay winding, the lock relay being operative when released to connectthe winding of the polarized relay to a supply circuit, the normalindication relay being operative when energized to establish a circuitthrough which current of normal polarity may be supplied to said supplycircuit, the reverse indication relay being operative when energized toestablish a circuit through which current of reverse polarity may besupplied to said supply circuit.

17. In combination, a railway track switch movable between a normal anda reverse position, a normal and a reverse indication device, anauxiliary relay having a contact movable between a first and a secondposition, said contact being operable in the first position to establishconnection from a control circuit to a first supply circuit and beingoperable in the second position to establish connection from saidcontrol circuit to a second supply circuit, a source of current, apolarized relay, a member movable in accordance with movement of theswitch and controlling a circuit for energizing the polarized relay,said member being operable in the normal position of the switch tosupply current of normal relative polarity to the polarized relay andbeing operable in the reverse position of the switch to supply currentof reverse relative polarity to the polarized relay, means controlledjointly by said member and a polar contact of said polarized relay forestablishing connection from one terminal of said source of current tosaid control circuit, said means being operable to establish suchconnection when and only when said member and the polar contact of thepolar relay are both in their normal positions or are both in theirreverse positions, said polarized relay being also operable when itspolar contacts are in their normal positions to establish connectionfrom the second supply circuit to one terminal of the winding of thenormal indication device and being operable when its polar contacts arein their reverse positions to establish connection from the first supplycircuit to one terminal of the winding of the reverse indication device,means for establishing connection from the other terminal of the windingof either of the indication devices to the other terminal of the sourceof current, the normal indication device being operative when energizedto energize the auxiliary relay to effect movement of its contact to itsfirst position and to establish connection from said one terminal ofsaid source to said second supply circuit, the reverse indication devicebeing operative when energized to energize the auxiliary relay to effectmovement of its contact to its second. position and to establishconnectionfrom said one terminal of said source to said first supplycircuit.

18. In combination, a railway track switch movable between a normal anda reverse position, a normal and a reverse indication device, a sourceof current, an auxiliary relay having a contact constantly connected toone terminal of said source of current, said contact being movablebetween a first position in which it establishes connection with a firstsupply circuit and a second. position in which it establishes connectionwith a second supply circuit, a member movable in accordance withmovement of the switch, said member being operative when and only whenthe switch is in the normal position to establish connection from saidsecond supply circuit to one terminal of the winding of the normalindication device, said member being operative when and only when theswitch is in the reverse position to establish connection from saidfirst supply circuit to one terminal of the winding of the reverseindication device, means for establishing connec' tion from the otherterminal of the winding of either of the indication devices to the otherterminal of the source of current, the normal indication device beingoperative when energized to establish connection from said one terminalof said source to said second supply circuit and to energize theauxiliary relay to effect movement of its contact to its first position,the reverse indication device being operative when energized toestablish connection from said one terminal of said source to said firstsupply circuit and to en ergize the auxiliary relay to effect movementof its contact to its second position.

CHARLES W. BELL.

